Other than the names of the central characters, this movie bears only passing resemblance to the book. That being said, it works, most of the time. Mitch Rapp is totally believable. Michael Keaton is in darn good shape for a man his age, and his character is believable.
It's too bad that the producers bowed to the cancer of political correctness and made Irene Kennedy black. That was so out of keeping with the Mitch Rapp books. Shame on Hollywood for bowing to pressure.
All in all, the movie was worth the price of the ticket, and I only hope it does well enough at the box office to ensure that the series continues.